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Preparing to upgrade Cassandra

To prepare for Cassandra upgrade

1. Ensure that all Cassandra nodes are ready. Run the following command and verify that all nodes are Up and Normal:
   

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   language bash theme DJango linenumbers true
   nodetool status

2. Leave the Cassandra service running but stop all Teamwork Cloud services.
3. Back up your current database before upgrading.
4. Upgrade all Cassandra data tables to current version by running the following command:
   

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   nodetool upgradesstables

   Note
   This process can take a long time for large databases. To run the upgrade process in the background, you can use the Linux nohup command: Code Block language bash theme DJango linenumbers true nohup nodetool upgradesstables & Make sure this process is completed before proceeding!

Upgrading Cassandra

To upgrade Cassandra

1. IMPORTANT! Flush memtables to the disk by executing the following command:

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   nodetool drain

2. Stop the Cassandra service.

3. Backup the Cassandra configuration file at: /etc/cassandra/default.conf/cassandra.yaml

4. Make a note of the existing cluster name and token count with the following command:

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   grep -E 'num_tokens:|cluster_name:' cassandra.yaml

5. Uninstall/remove Cassandra (example with yum package manager)

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   sudo yum remove -y cassandra

6. Install new version of Cassandra (for installation instructions, see Installing Cassandra on Linux or Installing Cassandra on Windows).

7. Check the cluster name and token count in cassandra.yaml. If needed, replace the default values with the values set in the previous version. The example below shows the default values for a Cassandra installation. 

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   language bash title Example
   cluster_name: 'Test Cluster' num_tokens: 16

   Note
   title Cassandra 4 Configuration
   The cluster name and token count must match those values set in the previous version of Cassandra.

9. Start the Cassandra service.

10. Check if the service is running smoothly:

    • Check the log file for startup errors.

    • Verify that all nodes have a status of Up and Normal with this command:

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      nodetool status

Additional resources

For more information about upgrading Apache Cassandra, see https://www.datastax.com/learn/whats-new-for-cassandra-4/migrating-cassandra-4x.